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CVE-2018-16884

Published: 18 December 2018

A flaw was found in the Linux kernel's NFS41+ subsystem. NFS41+ shares mounted in different network namespaces at the same time can make bc_svc_process() use wrong back-channel IDs and cause a use-after-free vulnerability. Thus a malicious container user can cause a host kernel memory corruption and a system panic. Due to the nature of the flaw, privilege escalation cannot be fully ruled out.

From the Ubuntu Security Team

Vasily Averin and Evgenii Shatokhin discovered that a use-after-free vulnerability existed in the NFS41+ subsystem when multiple network namespaces are in use. A local attacker in a container could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Priority

Medium

Cvss 3 Severity Score

8.0

Score breakdown

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-50.54)
cosmic
Released (4.18.0-20.21)
disco Not vulnerable
(4.19.0-12.13)
trusty Ignored
(was needed ESM criteria)
upstream
Released (5.0~rc1)
xenial
Released (4.4.0-145.171)
Patches:
Introduced by

23c20ecd44750dd42e5fd53285a17ca8d8a9b0a3

Fixed by b8be5674fa9a6f3677865ea93f7803c4212f3e10
Introduced by

23c20ecd44750dd42e5fd53285a17ca8d8a9b0a3

Fixed by d4b09acf924b84bae77cad090a9d108e70b43643
linux-flo
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.0~rc1)
xenial Ignored
(abandoned)
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1039.41)
cosmic
Released (4.18.0-1016.18)
disco Not vulnerable
(5.0.0-1001.1)
trusty
Released (4.4.0-1040.43)
upstream
Released (5.0~rc1)
xenial
Released (4.4.0-1079.89)
linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-1018.18~18.04.1)
cosmic
Released (4.18.0-1018.18)
disco Not vulnerable
(5.0.0-1001.1)
trusty
Released (4.15.0-1045.49~14.04.1)
upstream
Released (5.0~rc1)
xenial
Released (4.15.0-1045.49)
linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.15.0-1039.41~16.04.1)
linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-1011.12~18.04.1)
cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Does not exist

linux-azure-edge
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-1018.18~18.04.1)
cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.15.0-1045.49)
linux-euclid
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Ignored
(was needs-triage ESM criteria)
linux-gcp
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1032.34)
cosmic
Released (4.18.0-1011.12)
disco Not vulnerable
(5.0.0-1001.1)
trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.15.0-1032.34~16.04.1)
linux-gke
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Ignored
(end of standard support)
linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1032.34)
disco Does not exist

upstream
Released (5.0~rc1)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-1011.11~18.04.1)
disco Does not exist

upstream
Released (5.0~rc1)
xenial Does not exist

linux-goldfish
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.0~rc1)
xenial Ignored
(end of life)
linux-grouper
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.0~rc1)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-20.21~18.04.1)
cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.15.0-50.54~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-15.16~18.04.1)
cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.15.0-50.54~16.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1034.34)
cosmic
Released (4.18.0-1012.12)
disco Not vulnerable
(5.0.0-1001.1)
trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.4.0-1043.49)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Does not exist

linux-lts-utopic
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Ignored
(end of life, was ignored)
upstream
Released (5.0~rc1)
xenial Does not exist

linux-lts-vivid
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Ignored
(end of life, was ignored)
upstream
Released (5.0~rc1)
xenial Does not exist

linux-lts-wily
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Ignored
(end of life, was ignored)
upstream
Released (5.0~rc1)
xenial Does not exist

linux-lts-xenial
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty
Released (4.4.0-144.170~14.04.1)
upstream
Released (5.0~rc1)
xenial Does not exist

linux-maguro
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.0~rc1)
xenial Does not exist

linux-mako
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.0~rc1)
xenial Ignored
(abandoned)
linux-manta
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.0~rc1)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1038.43)
cosmic
Released (4.15.0-1038.43)
disco
Released (4.15.0-1038.43)
trusty Does not exist

upstream
Released (5.0~rc1)
xenial Ignored
(end of standard support, was needs-triage)
linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1013.15)
cosmic
Released (4.15.0-1013.15)
disco
Released (4.15.0-1013.15)
trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.15.0-1013.15~16.04.1)
linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1036.38)
cosmic
Released (4.18.0-1014.16)
disco Not vulnerable
(5.0.0-1004.4)
trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.4.0-1106.114)
linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1053.57)
cosmic Does not exist

disco Not vulnerable
(5.0.0-1010.10)
trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.4.0-1110.115)

Severity score breakdown

Parameter Value
Base score 8.0
Attack vector Adjacent
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H